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Theorem ialgrlem1st 12180
Description: Lemma for ialgr0 12182. Expressing algrflemg 6283 in a form suitable for theorems such as seq3-1 10533 or seqf 10535. (Contributed by Jim Kingdon, 22-Jul-2021.)
Hypothesis
Ref Expression
ialgrlem1st.f (𝜑𝐹:𝑆𝑆)
Assertion
Ref Expression
ialgrlem1st ((𝜑 ∧ (𝑥𝑆𝑦𝑆)) → (𝑥(𝐹 ∘ 1st )𝑦) ∈ 𝑆)

Proof of Theorem ialgrlem1st
StepHypRef Expression
1 algrflemg 6283 . . 3 ((𝑥𝑆𝑦𝑆) → (𝑥(𝐹 ∘ 1st )𝑦) = (𝐹𝑥))
21adantl 277 . 2 ((𝜑 ∧ (𝑥𝑆𝑦𝑆)) → (𝑥(𝐹 ∘ 1st )𝑦) = (𝐹𝑥))
3 ialgrlem1st.f . . . 4 (𝜑𝐹:𝑆𝑆)
43adantr 276 . . 3 ((𝜑 ∧ (𝑥𝑆𝑦𝑆)) → 𝐹:𝑆𝑆)
5 simprl 529 . . 3 ((𝜑 ∧ (𝑥𝑆𝑦𝑆)) → 𝑥𝑆)
64, 5ffvelcdmd 5694 . 2 ((𝜑 ∧ (𝑥𝑆𝑦𝑆)) → (𝐹𝑥) ∈ 𝑆)
72, 6eqeltrd 2270 1 ((𝜑 ∧ (𝑥𝑆𝑦𝑆)) → (𝑥(𝐹 ∘ 1st )𝑦) ∈ 𝑆)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1364  wcel 2164  ccom 4663  wf 5250  cfv 5254  (class class class)co 5918  1st c1st 6191
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-pow 4203  ax-pr 4238  ax-un 4464
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ral 2477  df-rex 2478  df-v 2762  df-sbc 2986  df-un 3157  df-in 3159  df-ss 3166  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-uni 3836  df-br 4030  df-opab 4091  df-mpt 4092  df-id 4324  df-xp 4665  df-rel 4666  df-cnv 4667  df-co 4668  df-dm 4669  df-rn 4670  df-res 4671  df-ima 4672  df-iota 5215  df-fun 5256  df-fn 5257  df-f 5258  df-fo 5260  df-fv 5262  df-ov 5921  df-1st 6193
This theorem is referenced by:  ialgr0  12182  algrp1  12184
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